package com.hashTable;

import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;

public class ThreeSum0131_15 {
    public List<List<Integer>> threeSum(int[] nums) {
        List<List<Integer>> list = new ArrayList<>();
        Arrays.sort(nums);

        for (int i = 0; i < nums.length - 2; i++) {
            if(i>0 && nums[i] == nums[i-1]) continue;

            int left = i+1, right = nums.length -1;
            while (left < right){
                if(nums[i] + nums[left] + nums[right] == 0){
                    list.add(Arrays.asList(nums[i],nums[left],nums[right]));
                    while (left < right && nums[left] == nums[left + 1]) left++;
                    while (left < right && nums[right] == nums[right - 1]) right--;
                    left++;right--;
                }else if(nums[i] + nums[left] + nums[right] > 0) right--;
                else left++;
            }
        }

        return list;
    }
}
